Abstract
The substituted metal alkoxides (EtO)3Ti(lysinate) or (BuO)3Ti(lysinate) are obtained when 1 equiv of lysine is added to Ti(OEt)4 or Zr(OBu)4. While the α-amino carboxylate moiety chelates the titanium or zirconium atom, the terminal amino group is capable of coordinating a metal ion. According to spectroscopic data, the complexes (AcO)2{M[NH2(CH2)4CH(NH2)COO]E(OR)3]4} (M = Co, Ni, Cu; E = Ti, Zr) are formed upon addition of M(OAc)2 to ethanolic solutions of (RO)3E(lysinate). The coordination of lysine and of the late transition metal ions is retained during sol−gel processing. There is no leaching of Co, Ni, or Cu ions from the metal complex-containing gels (AcO)2{M[NH2(CH2)4CH(NH2)COO]EO3/2]4}. Upon oxidation of the gels in air at 500 °C, nanosized CoTiO3 and NiTiO3 particles in TiO2, CuO particles in TiO2, or MO particles in ZrO2 were obtained. Subsequent reduction with hydrogen at 500 °C resulted in metallic nanoparticles dispersed in titania or zirconia. Composites of the same composition were prepar...
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